/in/foo.cc: In function 'int main()':
/in/foo.cc:9:6: error: storage size of 'a' isn't known
  int a[][2];
      ^
/in/foo.cc:29:6: warning: init-statement in selection statements only available with -std=c++1z or -std=gnu++1z
   if(a[i][0]!=a[i-1][0]
      ^
/in/foo.cc:31:2: error: expected primary-expression before '}' token
  }
  ^
/in/foo.cc:31:2: error: expected ')' before '}' token
/in/foo.cc:31:2: error: expected primary-expression before '}' token